The Cave of the Crystals is a remarkable geological formation located in the Naica mine in Chihuahua, Mexico. Discovered in 2000, it is famous for its large selenite crystals, some measuring over 11 meters in length. The cave's unique environment, with high temperatures and humidity, allows these crystals to grow to such impressive sizes. The cave is situated about 300 meters below the surface and is filled with mineral-rich water. The extreme conditions make it inhospitable for most life forms, but the stunning beauty of the crystals attracts scientists and geologists. The cave is part of the larger Naica mine, which has been a source of lead, zinc, and silver.